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Remote Operation Teledyne API – Technical Manual - Model 300E Family CO Analyzers
150
Male DB-9 (RS-232)
(As seen from outside analyzer)
(DTE mode)
(DCE mode)
1 2 3 4 5
6 7 8 9
RXD
GND
TXD
CTS
RTS
1 2 3 4 5
6 7 8 9
TXD
GND
RXD
RTS
CTS
Female DB-9 (COM2)
(As seen from outside analyzer)
(DTE mode)
1 234 5
6 789
RXD
GND
TXD
CTS
RTS
Figure 8-1: Default Pin Assignments for Back Panel COMM Port connectors (RS-232 DCE & DTE)
The signals from these two connectors are routed from the motherboard via a wiring harness to two 10-pin
connectors on the CPU card, J11 (RS-232) and J12 (COM2).
Figure 8-2: Default Pin Assignments for CPU COM Port connector (RS-232)
Teledyne API offers two mating cables, one of which should be applicable for your use.
Part number WR000077, a DB-9 female to DB-9 female cable, 6 feet long. Allows connection of the serial
ports of most personal computers. Also available as Option 60 (see Section 5.7.1).
Part numbe
r WR000024, a DB-9 female to DB-25 male cable. Allows connection to the most common
styles of modems (e.g. Hayes-compatible) and code activated switches.
Both cables are configured with straight-through wiring and should require no additional adapters.
NOTE
Cables that appear to be compatible because of matching connectors may incorporate internal wiring
that makes the link inoperable. Check cables acquired from sources other than Teledyne API for pin
assignments before using.
To assist in properly connecting the serial ports to either a computer or a modem, there are activity indicators just
above the RS-232 port. Once a cable is connected between the analyzer and a computer or modem, both the
red and green LEDs should be on.
If the lights are not lit, use small switch on the rear panel to switch it between DTE and DCE modes.
If both LEDs are still not illuminated, make sure the cable properly constructed.
04288D DCN5752